From the few posts I seen it looks like the New iMac i9 is 13% faster in multicore and 6% faster in single core to the MM i7.
I am getting these calculations from a poster Samppaa
Score for the processor: Single core 6256, Multi-Core 30582
vs my i7 Geek Bench 4 runs about 5900's and 26,700's
It will be interesting to see some i5 results.
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It can be a few things, if the iMac is still indexing from new, spotlight, photos etc. It can be heat related if you run the test over and over things typically slow down from my experience. The CPU best score comes from a cool machine with nothing running in the background. At least my experience shows this.